What is the [OH-] of a solution with a pH of 3.89? Which one is it?

7.76 x 10^-11

1.29 x 10^-4

2.11 x 10^-6

4.51 x 10^-10

Read the sentences below in 1962, i tried to enroll as the first black student at the university of mississippi. the governor of mississippi blocked my entrance which best describes the verbs used in the sentences? o they are past tense verbs, which are often used in narrative essays o they are past tense verbs, which are not often used in narrative essays. o they are future tense verbs, which are often used in narrative essays o they are future tense verbs, which are not often used in narrative essays.